Printable Hard Sudoku

Set 1giu4w7. 8 puzzles with an answer key, ready to print.

Hard puzzles start with about 29 givens and need real techniques: pointing pairs, naked pairs and hidden pairs. Paper is a great way to practice them, because you have to keep your own notes honest.

Each free PDF has 8 puzzles, four to a page on US Letter paper, plus an answer key with every solution. Every puzzle has exactly one solution. A new set appears here every day, or you can grab a different set any time.

Puzzles in this set

Hard #1
6 2 1 7 4
3 2
9 5
5 8 9 2
7 8
4 8 3 7 9 5
1
3 1 5 4
2 3 6
Hard #2
7 5
4 9 8
5 9 6 3
7 8 6
6 2
1 7 9
6 1 4 9 7
1 7 2
9 6 1 8
Hard #3
3 8 4 7 5
6 1 3
7 9 4
4 9 2 3 1
5 7
3 7 1 9
2 5 9
6 9
3 1
Hard #4
6 2 4
5 3 9 1
1 9 5 2
2 6
7 1 6 4 3
4 3
3 1 6
5 9
4 8 9 1
Hard #5
4
7 1 2 6
7
9 2 5 1
1 7 9 3
6 9 4 8
2 4 5 1
1 7 2 6 9
6 2
Hard #6
9 8 7
5 3 9
4 7 8
2 8 6 5
7 1 9
9 3 8
2 1 7
7 5 2 4
3 5 1
Hard #7
7 6 5 3 4
8 4 2
1 6 9
7
8 3 7 5 4 6
3 8
2 7 6 9 1
5
6 7 1
Hard #8
8 9
3 2 1 5 9
7 4 2 3
6 9 4 5
2 7
5 3 1
8 2
9 1 6 3 4
2 9

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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